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<Title>Log Scale Axis</Title>
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<p class="heading0">ChartDirector 7.0 (Java Edition)</p>
<p class="heading1">Log Scale Axis</p>
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<img src="images/logaxis0.png" width='200' height='180'>&nbsp;&nbsp;<img src="images/logaxis1.png" width='200' height='180'>
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This example demonstrates using a log scale axis versus a linear scale axis.<br><br>
In ChartDirector, log scale axis can be configured using <a href="Axis.setLogScale.htm">Axis.setLogScale</a>, <a href="Axis.setLogScale2.htm">Axis.setLogScale2</a> or <a href="Axis.setLogScale3.htm">Axis.setLogScale3</a>.
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<p class="heading1a">Source Code Listing</p>
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<b>[JSP Version]</b> jspdemo/logaxis.jsp
<div class='codeblock'><code class='pre'>&lt;%@page import="ChartDirector.*, java.util.*" %&gt;
&lt;%!
// Function to create the demo charts
void createChart(WebChartViewer viewer, int chartIndex)
{
    // The data for the chart
    double[] data = {100, 125, 260, 147, 67};
    String[] labels = {"Mon", "Tue", "Wed", "Thu", "Fri"};

    // Create a XYChart object of size 200 x 180 pixels
    XYChart c = new XYChart(200, 180);

    // Set the plot area at (30, 10) and of size 140 x 130 pixels
    c.setPlotArea(30, 10, 140, 130);

    // Ise log scale axis if required
    if (chartIndex == 1) {
        c.yAxis().setLogScale3();
    }

    // Set the labels on the x axis
    c.xAxis().setLabels(labels);

    // Add a color bar layer using the given data. Use a 1 pixel 3D border for the bars.
    c.addBarLayer3(data).setBorderColor(-1, 1);

    // Output the chart
    viewer.setChart(c, Chart.SVG);

    // Include tool tip for the chart
    viewer.setImageMap(c.getHTMLImageMap("", "", "title='Mileage on {xLabel}: {value} miles'"));
}
%&gt;
&lt;%
// This example includes 2 charts
WebChartViewer[] viewers = new WebChartViewer[2];
for (int i = 0; i &lt; viewers.length; ++i) {
    viewers[i] = new WebChartViewer(request, "chart" + i);
    createChart(viewers[i], i);
}
%&gt;
&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;Log Scale Axis&lt;/title&gt;
    &lt;!-- Include ChartDirector Javascript Library to support chart interactions --&gt;
    &lt;script type="text/javascript" src="cdjcv.js"&gt;&lt;/script&gt;
&lt;/head&gt;
&lt;body style="margin:5px 0px 0px 5px"&gt;
    &lt;div style="font:bold 18pt verdana;"&gt;
        Log Scale Axis
    &lt;/div&gt;
    &lt;hr style="border:solid 1px #000080; background:#000080" /&gt;
    &lt;div style="font:10pt verdana; margin-bottom:1.5em"&gt;
        &lt;a href="viewsource.jsp?file=&lt;%=request.getServletPath()%&gt;"&gt;View Source Code&lt;/a&gt;
    &lt;/div&gt;
    &lt;!-- ****** Here are the chart images ****** --&gt;
    &lt;%
        for (int i = 0; i &lt; viewers.length; ++i) {
            out.write(viewers[i].renderHTML(response));
            out.write(" ");
        }
    %&gt;
&lt;/body&gt;
&lt;/html&gt;</code></div>
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<br><hr class="separator"><div class="copyright">&copy; 2022 Advanced Software Engineering Limited. All rights reserved.</div>
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